31 Aug 2022
31 Aug 2022
Status: this preprint is currently under review for the journal ANGEO.

The solar induced 27-day modulation on polar mesospheric cloud (PMC), based on the combined observations from SOFIE and MLS

Shican Qiu1, Mengzhen Yuan1,2, Willie Soon3,4, Victor Manuel Velasco Herrera5, Zhanming Zhang1,2, and Xiankang Dou2 Shican Qiu et al.
  • 1Department of Geophysics, College of the Geology Engineering and Geomatics, Chang’an University, Xi’an, 710054, China
  • 2Key Laboratory of Geospace Environment, Chinese Academy of Sciences, University of Science & Technology of China, Hefei, Anhui, 230026, China
  • 3Center for Environmental Research and Earth Sciences (CERES), Salem, MA 01970, USA
  • 4Institute of Earth Physics and Space Science (ELKH EPSS), 9400, Sopron, Hungary
  • 5Instituto De Geofísica, Universidad Nacional Autónoma De México, Mexico City, Mexico

Abstract. Temperature is considered to be the key driving factor of the polar mesospheric cloud (PMC) variations, and the external source of temperature change is mainly from the solar radiations. In this paper, we use the observations of vertical column of ice water content (IWC) and mesopause temperature collected by the Solar Occultation For Ice Experiment (SOFIE), combined with the temperature data of Microwave Limb Sounder (MLS), to determine the time lags between temperature and IWC anomalies in responding to the solar radiation index Y10, through superposed epoch analysis (SEA) and time lag correlation analysis methods. The results show that the IWC responses to the Y10 later than the mesospheric temperature does. Further investigation of the relationship between mesospheric temperature and PMC reveals that the average time lag day is 0 days in the northern hemisphere (NH), and 1 day in the southern hemisphere (SH). The differences in temperature response to the 27-day solar rotational modulation with atmospheric pressure and latitude are analyzed, based on the temperature observations from 2004 to 2020 by MLS. Twelve PMC seasons with 27-day periodicity are distinguished, with 9 of them have time lags increasing with atmospheric pressure (or decreasing with altitude).

Shican Qiu et al.

Status: open (until 13 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2022-22', Anonymous Referee #1, 27 Sep 2022 reply
  • RC2: 'Comment on angeo-2022-22', Anonymous Referee #2, 01 Oct 2022 reply

Shican Qiu et al.

Shican Qiu et al.


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Short summary
In this paper, the solar radiation index Y10 acts as an indicator of the solar activity, and the vertical column of ice water content (IWC) characterizes the nature of the polar mesosphere cloud (PMC). Superposed epoch analysis is used to determine the time lag days of temperature and IWC anomalies in responding to Y10 for the PMC seasons from 2007–2015. The results show that the IWC can respond quickly to temperature within time lag of one day.